Give an example of a physical change for each of the following relations between `DeltaH and DeltaU`:
(i) `DeltaH gt DeltaU`
(ii) `DeltaH lt DeltaU`
(iii) `DeltaH~~DeltaU`.

Explanation

The equation `DeltaH=DeltaU+DeltanRT` can be used in case of a process involving phase change of a substance.
(i) `H_(2)O(l)toH_(2)O(g)`. Here, `Deltan=+1`. So, `DeltaH gt DeltaU`.
(ii) `H_(2)O(g)toH_(2)O(l)`. Here `Deltan=-1`. So, `DeltaH lt DeltaU`.